1. BACKLIN, E., Upsala Lak. Forhandl., 1930, 35, 105.
2. Mikromethoden der Blutanalyse;BANG, I.,1922
3. DONALDSON, H. H., Jour. Comp. Neurol. and Psychol., 1910, 20, 119.
4. FiSHER, R. A., Statistical Methods for Research Wrorkers, 1925.
5. FISKE, C. H., and SUBBAROW, Y., Jour. Biol. Chenm., 1925, 66, 375.